The Northwest Film Center presents “M,” a new digital restoration of one of the most influential films in the thriller genre. Fritz Lang's first sound film is a haunting, terrifying dive into an urban underworld where the lines between good and evil are disturbingly murky. Peter Lorre plays a child murderer tracked by both the police and his criminal colleagues. Two screenings, Saturday, Nov. 2 at 4:30 p.m. and 7 p.m. at the Whitsell Auditorium Portland Art Museum.